<a href=http://onlineslangdictionary.com/meaning-definition-of/ragtop>ragtop</a> To link to this term in a wiki such as Wikipedia, insert the following. [http://onlineslangdictionary.com/meaning-definition-of/ragtop ragtop] Some wikis use a different format for links, so be sure to check the documentation.
Talc (1), the softest mineral on the Mohs scale has a hardness greater than gypsum (2) in the direction that is perpendicular to the cleavage. Diamonds (10) also show a variation in hardness (the octahedral faces are harder than the cube faces).
The harder a mineral is, the more likely it is to be valuable. If you can scratch the mineral with your fingernail, it has a hardness of 2.5 Mohs, which is very soft. If you can scratch it with a penny, its hardness is 3 Mohs, and if it takes a piece of glass to scratch it, the hardness is 5.5 Mohs.